Colloidal Tungstic Acid-IV

The composition of the hydrosol has not been determined, but it is thought to consist of tungstic acid in combination with water, or possibly with sodium tungstate, since Sabaneeff obtained an amorphous powder, of composition Na₂O.4WO₃, from the dialysed solution.

When the solution is evaporated to dryness, transparent vitreous scales remain, strongly adherent to the crucible; on heating this residue to redness, the trioxide WO₃ results. The aqueous solution has a bitter astringent taste; its density at 19° C. is as follows:

The gelatinisation of silicic acid is retarded by the presence of colloidal tungstic acid.

 

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